Machubu ogwirira ntchito: mkuwa, aluminiyamu, ntylon. Njira za Copper Copy: 1. Sungani chubu cha mkuwa pamtunda wolumikizidwa ndikufikira pansi, screw pa chubu chamafuta.2. Muzimva kugwedeza pansi kenako ndikulimbana pang'ono. Pambuyo pa kulumikizana, Chisindikizo chimachotsedwa potayika, shrinkage, tsenga chitoliro cha mkuwa chitha kukhala.
